<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="btn">显示当前时间</button>
    <div id="time">时间</div>
    <div id="timer">shijian</div>
    <script>
        var timebtn = document.getElementById('btn')
        var time = document.getElementById('time')
        var date = new Date()
        timebtn.onclick = function() {
            
            time.innerText = date

        }
        var timer = document.getElementById('timer')
        timer.innerText = date
    </script>
</body>
</html>